net.javacrumbs.springws.test.template.XsltTemplateProcessor.java Source code

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Here is the source code for net.javacrumbs.springws.test.template.XsltTemplateProcessor.java

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/**
 * Copyright 2009-2010 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.javacrumbs.springws.test.template;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import javax.xml.transform.Source;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import net.javacrumbs.springws.test.util.DefaultXmlUtil;
import net.javacrumbs.springws.test.util.XmlUtil;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.core.io.ByteArrayResource;
import org.springframework.core.io.Resource;
import org.springframework.ws.WebServiceMessage;
import org.springframework.xml.transform.ResourceSource;
import org.w3c.dom.Document;

/**
 * Evaluates XSLT template.
 * @author Lukas Krecan
 *
 */
public class XsltTemplateProcessor implements TemplateProcessor {

    private static final String XSL_NAMESPACE = "http://www.w3.org/1999/XSL/Transform";

    private final Log logger = LogFactory.getLog(getClass());

    private XmlUtil xmlUtil = DefaultXmlUtil.getInstance();

    public Resource processTemplate(Resource resource, WebServiceMessage message) throws IOException {
        if (resource != null) {
            if (isTemplate(resource)) {
                return transform(resource, message);
            } else {
                return resource;
            }
        } else {
            return null;
        }
    }

    protected boolean isTemplate(Resource resource) throws IOException {
        Document document = loadDocument(resource);
        return XSL_NAMESPACE.equals(document.getFirstChild().getNamespaceURI());
    }

    protected Document loadDocument(Resource resource) throws IOException {
        return getXmlUtil().loadDocument(resource);
    }

    protected Resource transform(Resource resource, WebServiceMessage message) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Source envelopeSource = message != null ? getXmlUtil().getEnvelopeSource(message) : new DOMSource();
        getXmlUtil().transform(new ResourceSource(resource), envelopeSource, new StreamResult(baos));
        if (logger.isDebugEnabled()) {
            logger.debug("Transformation result:\n" + new String(baos.toByteArray(), "UTF-8"));
        }
        return new ByteArrayResource(baos.toByteArray());
    }

    public XmlUtil getXmlUtil() {
        return xmlUtil;
    }

    public void setXmlUtil(XmlUtil xmlUtil) {
        this.xmlUtil = xmlUtil;
    }

}